ten-vad driver WIP

.cargo/config.toml

@@ -2,4 +2,4 @@
 public-dependency = true
 
 [env]
-RUST_TEST_THREADS = "8"
+RUST_TEST_THREADS = "4"

crates/bunsen/src/burner/mod.rs

@@ -42,6 +42,8 @@
 //!   Headlined by the `GroupOptimizerAdaptor{N}` family and the
 //!   `OptimizerGroup` / `LrSelector` building blocks.
 //! - [`record`] — helpers for working with `burn::record` types.
+//! - [`repro`] — standalone, backend-generic reproductions of bugs in
+//!   `burn` itself, written to be lifted out and taken upstream unchanged.
 //! - [`tensor`] — tensor helpers that don't fit neatly in [`crate::ops`]:
 //!   `Tensor` extension traits and `TensorData` index views.
 //! - [`distribution`] — distribution-related utilities.
@@ -76,6 +78,7 @@ pub mod descriptors;
 pub mod distribution;
 pub mod module;
 pub mod record;
+pub mod repro;
 
 #[cfg(feature = "train")]
 pub mod optim;

crates/bunsen/src/burner/repro/mod.rs

@@ -0,0 +1,31 @@
+//! # Standalone reproductions of upstream `burn` bugs.
+//!
+//! Backend-generic, dependency-free harnesses for defects in `burn` itself,
+//! written so they can be lifted out of this crate and taken upstream
+//! unchanged. Each one uses only `burn`'s public tensor surface.
+//!
+//! ## How this differs from the pins
+//!
+//! These two modules assert *opposite* things, deliberately:
+//!
+//! | | asserts | fails when |
+//! |---|---|---|
+//! | `burner::repro` | the **correct** semantics | the bug is present |
+//! | `burner::tensor::burn_behavior` | the **current** behavior | the bug is fixed |
+//!
+//! The pins keep bunsen's own suite green while guaranteeing that a fix
+//! announces itself and names the workarounds it makes redundant. The
+//! reproductions here are the bug report: run one against a candidate fix and
+//! a pass means the fix works.
+//!
+//! So the functions here **fail on affected backends today**. That is their
+//! job, and it is why they are not wired into the default test suite — the
+//! tests that drive them are `#[ignore]`d.
+//!
+//! ## Running them
+//!
+//! ```text
+//! cargo test -p bunsen --lib --features wgpu -- burner::repro --ignored --nocapture
+//! ```
+
+pub mod unfold;